特定阶的子群都同构且交换的有限p-群

研究某些子群同构的有限p-群是很有趣的.例如,Hermann和Mann都曾研究过极大子群都同构的有限p-群,但这类群的结构非常复杂,到现在人们都没能给出其分类.研究了特定阶的子群都同构且交换的有限p-群,并给出其分类.     

亚纯系数的高阶线性微分方程的解的增长性

本文研究亚纯系数的高阶线性微分方程,当方程系数满足一定条件时,得到方程的每一非零亚纯解具有无穷级且超级为n.此外,还研究了非齐次线性微分方程的亚纯解.     

Metallic nanowires for subwavelength waveguiding and nanophotonic devices

Plasmonics is a rapidly developing field concerning light manipulation at the nanoscale with many potential applications, of which plasmonic circuits are promising for future information technology. Plasmonic waveguides are fundamental elements for constructing plasmonic integrated circuits. Among the proposed different plasmonic waveguides, metallic nanowires have drawn much attention due to the highly confined electromagnetic waves and relatively low propagation loss. Here we review the recent research progress in the waveguiding characteristics of metallic nanowires and nanowire-based nanophotonic devices. Plasmon modes of both cylindrical and pentagonal metallic nanowires with and without substrate are discussed. Typical methods for exciting and detecting the plasmons in metallic nanowires are briefly summarized. Because of the multimode characteristic, the plasmon propagation and emission in the nanowire have many unique properties, benefiting the design of plasmonic devices. A few nanowire-based devices are highlighted, including quarter-wave plate, Fabry-Prot resonator, router and logic gates.     

Shaping of few-cycle laser pulses via a subwavelength structure

We theoretically investigate the propagation of few-cycle laser pulses in resonant two-level dense media with a sub- wavelength structure, which is described by the full Maxwell-Bloch equations without the frame of slowly varying envelope and rotating wave approximations. The input pulses can be shaped into shorter ones with a single or less than one optical cycle. The effect of the parameters of the subwavelength structure and laser pulses is studied. Our study shows that the media with a subwavelength structure can significantly shape the few-cycle pulses into a subcycle pulse, even for the case of chirp pulses as input fields. This suggests that such subwavelength structures have potential application in the shaping of few-cycle laser pulses.     

SOME NORMALITY CRITERIA OF MEROMORPHIC FUNCTIONS

Let F be a family of functions meromorphic in a domain D, let n ≥ 2 be a positive integer, and let a ≠ 0, b be two finite complex numbers. If, for each f ∈ F, all of whose zeros have multiplicity at least k ＋ 1, and f ＋ a（f^（k））^n≠b in D, then F is normal in D.     

CERTAIN SUFFICIENT CONDITIONS FOR STARLIKENESS AND CONVEXITY OF MEROMORPHICALLY MULTIVALENT FUNCTIONS

In this paper we derive certain suffcient conditions for starlikeness and con-vexity of orderαof meromorphically multivalent functions in the punctured unit disk.     

多羟基甾醇的合成(Ⅳ):20-亚甲基-4-孕烯-3β,6β-二醇的制备及其抗肿瘤活性研究

从孕烯醇酮(4)出发,经过6步反应合成新的多羟基甾醇化合物20-亚甲基-4-孕烯-β,6β-二醇(3),总收率为33.40％,并通过IR、^1H NMR 等谱图数据对化合物(3)的结构进行表征。用0．005 mg／ml化合物(3)和0．05 mg／ml的4-孕烯-3β,6β-二羟基-20-酮(9),通过MTT法对宫颈癌细胞(HELA)及白血病细胞(P-388)进行抗肿瘤细胞活性研究,结果表明,化合物(3)对HELA和P-388的生长均没有产生明显的细胞毒性。     

杂粕溢多酶在肥育猪生产中的应用

试验选用健康,体重40 kg左右的杜×长×大三元杂交猪64头随机分成8组,每组8头。日粮中杂粕含量为12.5％和20.5％,杂粕溢多酶的添加量分别为0％.0.05％,0.10％和0.15％。试验结果表明:日粮中杂粕含量越高,肥育猪的生长速度越慢,饲料转化效率越低;在相同杂粕含量的日粮中,日增重、饲料转化效率随着杂粕溢多酶添加量的增加而提高;在不同杂粕含量的日粮中添加相同量的杂粕溢多酶,杂粕含量少的日增重和饲料转化效率提高。杂粕型日粮中添加杂粕溢多酶能提高肥育猪的生长速度,提高饲料转化率,缩短饲养时间。     

SRB法检测亚硒酸钠对SGC-7901细胞生长的影响

目的检测亚硒酸钠对胃上皮细胞系SGC-7901细胞生长的影响.方法采用SRB实验法.结果5,10,20μmol/L的亚硒酸钠作用SGC-7901细胞24,48,72,96 h后,吸光度A值分别为:0.22,0.65,0.85,0.70;0.28,0.62,0.66,0.50;0.24,0.40,0.36,0.20.对照组为:0.36,0.72,1.25,1.30.结论亚硒酸钠对SGC-7901细胞的生长有明显的抑制作用,该抑制作用与亚硒酸钠的浓度和作用时间呈正相关.     

新型骨显像剂99mTc-EDP的合成与研究

以亚磷酸二乙酯为原料,经多步反应合成了亚乙烯基二膦酸(EDP)配体.通过1HNMR测定进行了结构确认;经99mTc标记后,标记率高于95%.体外稳定性测定表明,6h后放化纯度仍保持在90%以上.小鼠体内分布实验表明,99mTc-EDP与99mTc-MDP(99mTc-亚甲基二膦酸)均具有较强的亲骨性能,99mTc-EDP骨摄取优于99mTc-MDP,并且随着时间的增加,骨与非靶器官摄取的比值都在增加,远远高于99mTc-MDP.进行了狗SPECT全身骨显像实验,2h后获得清晰的图像.